HomeAssistant should works great on this device. If you have a bunch of smart devices from different brands and want to consolidate them into a single local system, give HomeAssistant a go. There should be plenty of resource left to run pihole/Adguard as well.
I'm not sure if the GPU is fast enough to run the Steam Link client, but if it does, you can hook it to your tv so you can stream your PC games into the tv when needed.
You can also hook it into a TailScale network and set it as an exit relay so you can have a VPN from your phone/laptop that redirect all internet traffics through your home network. Very useful when you want to secure your connection when using public WiFi in a hotel or cafe.
At least Xiaomi is telling their customers upfront that the reason they can sell their mid and low end android phones on the cheap ( by famously announcing to cap their hardware profit margin at 5% ) is due to advertising. IIRC their high end models do not have ads. Other manufacturers mocked xiaomi for this move, just like they mocked apple for removing headphone jack, then quietly follow the move anyway without telling their customers, which I think is an even bigger dick move.